LostnAmerica
500+ Head-Fier
My Rikubuds Caster 3 has the pk39(?) housing and they too also cause discomfort, I hope these are a little smaller.Oh yea I know what your talking about. The roundness of the bud itself can cause hot spots inside the concha of the ear. If that was your main concern. The conductor will fit you much better as it is physically smaller more compact physically, though it houses a rather larger 14.2mm dynamic.
Conductor bottom right corner. Penon BS1 left bottom and TGX Serratus on top. Serratus is actually common size for buds and it is much larger in comparison.

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